The invention discloses an inner pipe direct connection type full-length heat preservation and heat insulation pipe especially suitable for thick oil recovery in an oil field. The inner pipe direct connection type full-length heat preservation and heat insulation pipe comprises an inner pipe body, a heat preservation layer, an outer pipe body, an inner thread and an outer thread; the inner threadis machined at one end of the inner pipe body, and the outer thread is machined at the other end of the inner pipe body; the inner thread end of the inner pipe body is directly connected with the outer thread end of the inner pipe body of another heat insulation pipe; the end of the outer thread end of the inner pipe main body is thickened ordinarily, the end of the inner thread end of the inner pipe main body is thickened, and the thickened outer diameter of the end of the inner thread end of the inner pipe main body is 10-16 mm larger than that of the end of the outer thread end of the innerpipe main body; the end of an inner thread end of the outer pipe main body is flared, the clearance between the inner diameter of the flared position and the outer diameter of the thickened end of the inner thread end of the inner pipe main body is delta, the thickness of the heat preservation layer between the inner pipe body and the outer pipe body is theta, and delta is approximately equal totheta; and the heat preservation layer is also wound in an annular space at the thickened position of the inner thread end of the inner pipe body and the flared position of the inner thread end of theouter pipe body. The heat preservation layer is wound in the annular spacebetween the outer pipe body and the inner pipe body in a full-length mode, so that a large amount of heat loss in the connection position of the heat insulation pipes is avoided, and the heat preservation effect of the heat insulation pipe is improved by a large margin.